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SUMMARY:COSMIC RAYS\, CLIMATE AND THE CERN CLOUD EXPERIMENT - Jasper Kirkb
 y\, CERN
DTSTART:20120509T150000Z
DTEND:20120509T160000Z
UID:TALK37861@talks.cam.ac.uk
CONTACT:Leona Hope-Coles
DESCRIPTION:For more than two centuries\, scientists have been puzzled by 
 observations of solar-climate variability yet the lack of any established 
 physical mechanism. Some recent observations\, although disputed\, suggest
  that clouds may be influenced by cosmic rays\, which are modulated by the
  solar wind. The CLOUD experiment aims to settle the question of whether o
 r not cosmic rays have a climatically-significant effect on clouds by carr
 ying out a series of carefully-controlled measurements in a large cloud ch
 amber exposed to an ionising particle beam from the CERN Proton Synchrotro
 n. By current estimates\, about half of all cloud droplets are formed on a
 erosol particles that were "nucleated" from the clustering of trace atmosp
 heric vapours\, but the process is poorly understood. This talk will prese
 nt the scientific motivation for CLOUD and the first results on the influe
 nce of  trace atmospheric vapours and cosmic ray ionisation on the nucleat
 ion and growth of atmospheric aerosol particles.
LOCATION:Pippard Lecture Theatre\, Cavendish Laboratory
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